Civil Engineering - Water Resources Engineering MCQs Part 2

1. In nature water may occur as

A.
liquid

B.
solid

C.
vapours

D.
all the above.

 Answer Option D

2. Hydrology is the science which deals with

A.
rain water

B.
river water

C.
sea water

D.
surface and underground water

E.
flood water.

 Answer Option D

3. The surface run off is due to

A.
initial rain

B.
residual rain

C.
rain in the net supply interval

D.
all the above.

 Answer Option C

4. Hydrograph is a graphical representation of

A.
surface run off

B.
ground water flow

C.
rain fall

D.
discharge flowing in the river

E.
none of these.

 Answer Option D

5. The infiltration capacity during rain storm, is considerably reduced due to

A.
surface detention

B.
soil moisture

C.
compaction due to rain

D.
washing of fine particles

E.
all the above.

 Answer Option E

6. Rain simulators are used for the determination of

A. evaporation

B. precipitation

C. run off

D. infiltration capacity

E. none of these.

 Answer Option D

7. Precipitation includes

A. rain

B. snow

C. hail

D. all of these.

 Answer Option D

8. Pick up the correct statement from the following :

A. Central portion of a cyclone acts as a chimney through which air gets lifted

B. Cyclonic precipitation caused by a warm front is generally continuous

C. Convective precipitation generally occurs in the form of showers of high intensity in short duration

D. Greatest amount of orographic precipitation falls in the windward side of the barrier

E. All the above.

 Answer Option E

9. Non-recording rain gauges

A. collect the rain whose volume is measured by means of graduated cylinders

B. collect the rain which is directly measured by means of graduated cylinders in centimetres of water depth

C. are generally used in hilly terrain

D. are cylindrical in shape.

 Answer Option B

10. Indian Meteorological department uses the standard gauges whose collectors have apertures of

A. 50 or 100 sq. cm area

B. 100 or 150 sq. cm area

C. 100 or 200 sq. cm area

D. 250 or 500 sq. cm area.

 Answer Option C

11. The polythene bottles are used for collecting rain water and. their capacities is

A. 2 litres

B. 4 litres

C. 10 litres

D. all the above.

 Answer Option D

12. Symon's rain gauge is

A. tipping-bucket gauge

B. weighing type gauge

C. float recording gauge

D. non-recording gauge.

 Answer Option D

13. The rainfall cycle period in India is taken as

A. 15 years

B. 20 years

C. 25 years

D. 30 years

E. 35 years.

 Answer Option E

14. Pick up the correct statement from the following :

A.

B. Normal annual rainfall is obtained by taking the mean of the annual rainfall over a period of 35 years

C. Index of wetness gives an idea of the wetness of the year

D. If the rainfall in a year is approximately equal to the annual average value, the particular year is said to be an average year

E. All the above.

 Answer Option E

15. Isohytes are the imaginary lines joining the points of equal

A. pressure

B. height

C. humidity

D. rainfall.

 Answer Option D

16. The rainfall at any place is described by

A. its intensity

B. its duration

C. its frequency

D. all the above.

 Answer Option D

17. Pick up the correct statement from the following :

A. The intensity of rain is the rate at which it falls

B. The duration of rain is the time for which it falls with a given intensity

C. The frequency of rain is the number of times, if falls

D. All the above.

 Answer Option D

18. Pick up the incorrect statement from the following :

A. At two meteorologically homogeneous stations, the average annual precipitation is same

B. If the average annual precipitation at two places is same these are meteorologically homogeneous stations

C. Neither (a) nor (b)

D. Both (a) and (b).

 Answer Option B

19. Pick up the correct statement from the following :

A. The throat of the section of a control meter is either rectangular or trapezoidal

B. The floor of the control meter throat is almost level

C. The floor of the expanding outlet of the control meter is given a steep slope

D. A properly designed control meter is associated with the phenomena of hydraulic jump

E. All the above.

 Answer Option E

20. Discharge curve may be extended by logarithmic method if

A. cross section of river is uniform

B. river is broader and shallower

C. river is of any type

D. none of these.

 Answer Option A

21. The best instrument for measuring the velocity of a stream flow is

A. pitot tube

B. Price's current meter

C. surface float

D. sub-surface float.

 Answer Option B

22. The average mean velocity of a stream having depth h, may be obtained by taking the average of the readings of a current meter at a depth of

A. 0.1 h and 0.9 h

B. 0.2 h and 0.8 h

C. 0.3 h and 0.7 h

D. 0.4 h and 0.6 h.

 Answer Option B

23. If the velocities of flow of a stream of 10 m depth recorded by a current meter at depths of 2 m and 8 m are 0.7 m and 0.3 m respectively, the discharge per unit width of the stream in cubic metres, is

A. 2

B. 3

C. 4

D. 5

E. 6

 Answer Option D

24. If P and A are the perimeter and area of a drainage basin, its compactness coefficient, is

A.

B.

C.

D.

 Answer Option C

25. The time required by rain water to reach the outlet of drainage basin, is generally called

A. time of concentration

B. time of overland flow

C. concentration time of overland flow

D. duration of the rainfall

E. none of these.

 Answer Option A

26. Time of overland flow, is affected by

A. slope of the basin

B. type of the ground surface

C. length of the flow path

D. all the above.

 Answer Option D

27. The rate of rainfall for successive 10 minute periods of a 60 minute duration storm, are shown in the below figure. If the value of φindex is 3 cm/hour, the run off will be

A. 2 cm

B. 3 cm

C. 4 cm

D. 5 cm.

 Answer Option B

28. From the pattern of the rainfall shown in the below figure, the total precipitation is

A. 4 cm

B. 4.5 cm

C. 5 cm

D. 5.5 cm

E. 6 cm.

 Answer Option D

29. From the data of the rain storm shown in the below figure, the value of Windex is

A. 1.5 cm/hour

B. 2 cm/hour

C. 2.5 cm/hour

D. 2 cm/hour.

 Answer Option C

30. Izzard formula for the time of concentration in minutes for the plots having no channels, is (where Lo is the length of overland flow in metres and Kp rainfall intensity in cm/hour)

A.

B.

C.

D.

 Answer Option A

31. A unit hydrograph is a hydrograph of a rain storm of a specified duration resulting from a run-off of

A. 15 mm

B. 20 mm

C. 25 mm

D. 30 mm.

 Answer Option B

32. Pick up the correct statement from the following :

A. The specified duration of unit hydrograph, is called unit duration

B. The rain during specified duration, is called unit storm

C. A unit hydrograph for a particular unit duration may be utilised for evaluating the run off hydrographs of other storms of like durations

D. The number of unit hydrographs for a given basin, is theoretically infinite

E. All the above.

 Answer Option E

33. The best unit period of a unit hydrograph, is equal to basin lag divided by

A. 2

B. 3

C. 4

D. 5

 Answer Option C

34. If total run off of a basin of 50 hectares is 0.8 cm, the ordinate of Bernard's distribution graph, may be calculated by the formula (where Q is the discharge in cumecs at the given time)

A. y = 50 Q

B. y = 100 Q

C. y = 150 Q

D. y = 200 Q

E. y = 250 Q

 Answer Option E

35. Pick up the correct statement from the following :

A. The zone below water table, is called zone of saturation

B. The zone above water table, is called zone of aeration

C. The water which exists in the zone of saturation, is called ground water

D. Water in the zone of saturation, remains under hydrostatic pressure

E. All the above.

 Answer Option E

36. If the grain size of soil increases

A. surface area decreases

B. specific retention decreases

C. specific yield increases

D. water supply in well increases

E. all the above.

 Answer Option E

37. The equation which is used for determining the velocity of ground water flow in metres per day is known as

A. Meinzer's formula

B. Slichter's formula

C. Darcy's formula

D. Hazen formula.

 Answer Option D

38. Pick up the correct statement from the following :

A. A confined bed of impervious material laid over an acquifer, is known as an aquiclude

B. The top most water bearing strata having no acquifer, is known as non-artesion acquifer

C. The ordinary gravity wells which supply water from the top most water bearing strata, are called water table wells

D. A permeable stratum which is capable to yield appreciate quantities of ground water, is known as an aquifer

E. All the above.

 Answer Option E

39. While determining the yield of a gravity well by pumping, the depth of water table in two tests wells at distances r1 and r2 from the centre of the main well were found to be s1 and s2 respectively. Assuming the coefficient of transmissibility of the soil as T, the discharge Q may be given by

A.

B.

C.

D.

 Answer Option C

40. According to Thiem, the permeability of an aquifer may be obtained from the equation

A.

B.

C.

D.

E. all the above.

 Answer Option E

41. The Dupuit formula is based on

A. one observation well

B. two observation wells

C. three observation wells

D. no observation well

E. none of these.

 Answer Option D

42. A well is sunk in an unconfined aquifer having a saturated depth of 100 m. Assuming the equilibrium flow conditions and a homogeneous aquifer and radius of influence to be same, the ratio of discharges at 20 m and 40 m draw downs, is

A. 2/3

B. 5/4

C. 4/5

D. 7/8

E. 8/7

 Answer Option E

43. Evaporation losses depend upon

A. area of the water surface and depth of the water

B. nature of precipitation and type of vegetation

C. humidity and wind velocity

D. atmospheric temperature

E. all the above.

 Answer Option E

44. Phytometer method is generally used for the measurement of

A. interception

B. evaporation

C. transpiration

D. none of these.

 Answer Option C

45. In the estimate of design flood, Dickens assumes that high flood in cumecs, is proportional to catchment area raised to the power

A.

B.

C.

D.

 Answer Option C

46. For high flood estimates the average value of the constant C in Dicken's formula Q = CA3/4, is

A. 6.5

B. 8.5

C. 9.5

D. 10.5

E. 11.5

 Answer Option E

47. Pettis formula Q = C (P.B)5/4 cumecs, is based upon

A. rainfall and drainage area

B. run off and drainage area

C. drainage area and its shape

D. drainage area.

 Answer Option A

48. Boston society of Civil Engineer's formula in cumecs/square km is based upon

A. rainfall and drainage area

B. total run off and drainage area

C. drainage area and its shape

D. drainage area.

 Answer Option B

49. For predicting floods of a given frequency, the best reliable method is

A. Unit hydrograph method

B. Gumbel's analytical method

C. California method

D. None of these.

 Answer Option A

50. The earthen embankments constructed parallel to the river banks at some suitable distance for flood control, are known as

A. floods walls

B. river walls

C. levees

D. dikes

E. both (c) and (d).

 Answer Option E